Chapter 8 - Special Functions
8-1
Chapter 8 - Special Functions
This chapter describes the special features of the Omni 288S, and offers
instructions on how each is used.

Security Functions

The Omni 288S provides a security function that prevents unauthorized users from
making connections. Two types of security functions are provided.
 Type 1 security is used when the remote modem is also a ZyXEL modem.
 Type 2 security is used when the remote modem is any other brand.
The type 1 connection, the dial-in (remote) modem will send in its supervisor
password for checking at the initial connection , and the local modem will check
this password against its pre-stored acceptable password list.
The type 2 connection, the remote terminal will be prompted to enter the
password at the initial connection and the local modem will do the password
checking.

Levels of Security

Two levels of security are provided:
 With level 1 security, the local modem will maintain the connection if the
password is OK, otherwise the line disconnected.
 With level 2 security, dial back the phone number corresponding to the dial-
in password. The line simply disconnected if the password does not match.

User Passwords

50 user passwords may be defined. The corresponding 50 dial-back numbers are
the the modem’s 50 stored phone numbers. Any character (ASCII 0-127) can be
used in the password, the maximum password length is 8 characters.
The security functions are only accessible through AT commands in terminal
mode. Any access attempt will result in the modem’s prompting to enter the
supervisor password the attempt will be rejected if the entered password is not
correct. The default supervisor password is ZyXEL when the modem is shipped
from the factory. This supervisor password is also the password sent for
automatic password checking in a type 1 connection. To modify the supervisor
password, use AT*HS.
You will be asked for the original password and a new password and then to re-
enter the new password for verification. For example:
Password: (Enter supervisor password)